# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals
from scrapy.http import HtmlResponse
from selenium import webdriver
from selenium.webdriver import ActionChains
import time
from scrapy import signals

# useful for handling different item types with a single interface
from itemadapter import is_item, ItemAdapter


class CnblogSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class CnblogDownloaderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class LoginMiddleware(object):
    def __init__(self):
        self.browser = webdriver.Chrome()
        super(LoginMiddleware, self).__init__()

    def closeSpider(self, spider):
        self.browser.quit()

    def process_request(self, request, spider):
        if spider.name == "cnblog":
            url = 'https://account.cnblogs.com/signin?returnUrl=https:%2F%2Fwww.cnblogs.com%2F'
            self.browser.get(url)
            account = self.browser.find_element_by_id('mat-input-0')
            account.send_keys('791652232@qq.com')
            password = self.browser.find_element_by_id('mat-input-1')
            password.send_keys('chen1801')
            button = self.browser.find_element_by_xpath(
                '/html/body/app-root/div/mat-sidenav-container/mat-sidenav-content/div/div/app-sign-in/app-content-container/mat-card/div/form/div/button')
            button.click()
            time.sleep(2)
            box = self.browser.find_element_by_class_name('geetest_panel_next')
            if box:
                slider = self.browser.find_element_by_class_name('geetest_slider_button')
                action = ActionChains(self.browser)# 实例化一个action对象
                action.click_and_hold(slider).perform()# perform()用来执行ActionChains中存储的行为
                action.reset_actions()
                action.move_by_offset(180, 0).perform()# 移动滑块
                print(222)
            request.cookies = self.browser.get_cookies()
            return HtmlResponse(
                url=self.browser.current_url,
                body=self.browser.page_source,
                encoding="utf-8",
                request=request
            )
